Throttle



(No Model.) Y

J. P. GBIGER THROTTLE.

APatanted Ma ma/g2,

Wl E55 as;

(NMQM UNITED. STATES` PATENT OFFICE.

JOI-IN P.A GrlilIGrlilR,` OF ORWIGSBURG, PENNSYLVANIA.

TH'ROTTLE.

SPECIFICATION forming part of Letterslatent No. 603,684, dated May 10, 1898. Application flied December 24, 1896. SeralNo. 616,872. (No model.)

To OZZZ whom -z't' may concern:

Be it known that I, JOHN P. Gnrenn, a citizen of the United States, residing at Orwigsburg, in the county of Schuylkill and State of Pennsylvania, have in ventedy certain new and useful Improvements in Throttles; and I do hereby declare the following to be a full,clear, and exact description ofthe invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to throttle-valves for steam-engines,.such as locomotives, has especial reference to means for packing the rod of the valve, and consists in certain improvements in construction, which will be fully disclosed in the following specification and claims. Y

As throttle-valves are generally constructed Whenever the packing in the stuffing-box on the valve-rod requires renewal the fire must be drawn or banked and the steam blown off from the boiler, so that all pressure is removed from the throttle. It is my purpose to obviate this by providing a casing for the throttle-valve rod, applied to the exterior of the steam-dome of the boiler, and provided with means for preventing the escape of steam from the dome into the stuffing-box.

In the accompanying drawings,which form part of this specification, Figure l represents a side elevation of (my invention; Fig. 2, a vertical longitudinal section, on an enlarged scale, showing the valve onits outer seat and Fig. 8, a like view showing the valve on its inner seat.

Reference being had to the drawings and the letters thereon, A indicates a portion of a locomotive-boiler, B the steam-dome, and C a throttle-valve rod, all of which may be of any preferred form of construction.

D indicates a casing around the throttlevalve rod C, connected or attached to the eX- terior of the steam-dome B by a nipple a. The casing proper consists of a coupling b at its inner end which connects with theouter end of the nipple a and at its opposite end with the extension c of section d, and'within saidV coupling b is avalve-chamber e, having an inner valve-seat f, formed by the outer end of nipple a, and an outer valve-seat g, formed by the end of extension c, and a. primary stuing-box h, having a chamber for packing, and

a gland c', which engages the extension Zo of ythe section CZ for adjusting the packing.

Within the casing D is an annular valve Z, which surrounds the valve-rod C and is provided with facesm n, which engage the seats fand g, respectively, and with a tubular stem o, which iits the bore of section d, is internally screw-threaded at p, and engages the screwthread q on the valve-rod and is longitudinally movable thereon, as will hereinafter more fully appear. At the outer end of the stem o is a secondary stuffing box r to pack the valve-rod C, while the primary stuffingbox Zt packs the stem o of the valve Z, and adjacent to the gland is a collar Z, integral with thevalve-stem, for a wrench to engage with to screw the valve in or out on the valve-rod C. The end of the valve-rod is provided with a coupling u for connecting it with a valveoperating link or lever o.

The normal position of valve Z is shown in Fig. 2,With its face n engaging the outer seat g, in which position the throttle-valve is open and steam from the dome B fills the chamber e and surrounds the valve-rod C.

When it is desired to renew the packing in the stuffing-box h, the valve-rod C is pushed inward by the lever in the cab (not shown) and the lever secured in the usual manner, closing the throttle valve. The valve Z is then moved inward on .the valve-rod by revolving the valve Z on said rod until the face m of the valve rests against or upon the seat f, in which position the throttle-valve rod will be locked and steam prevented passing from the dome B into the valve-chamber c. The gland iis then unscrewed, and the packing removed from the stuffing-box and replaced by new packing, all of which can be accomplished while the boiler is under full head of steam and in a few minutes while a train is stopping at a station. The packing having been renewed, the valve Z is moved outward on the valve-rod and restored to its normal position, when the throttle-valve rod is free to move in the casing D, carrying the valve Z with it in its movements.

Having thus fully described my invention, what I claim is- IOO l. A fluid-pressure chamber, a valve-rod extending int-o said chamber and a easing for the rod connected to the Wall of the Chamber and provided With a valve-chamber in oombination With a valve Within said valve-chamber and surrounding the valve-rod; and a packing-chamber surrounding the stem of said valve.

2. A valve-rod and an inolosing easing oonneeted to the Wall of a fluid-pressure chamber, in combination with means for looking the valve-rod and means within the casing for preventing fluid from said chamber entering the easing.

3. A Huid-pressure Chamber, a valve-rod and a easing for the rod outside of said chamber and provided with a valve-chamber having tWo seats, in combination with a valve having two faces and surrounding the valverod, and a packing-chamber surrounding the stem of said valve.

4. A fluid-pressure chamber7 a valve-rod and a oasin g for the rod outside of said ehamber and provided with a valve-chamber, in combination with a valve surrounding the valve-rod and movably secured thereto.

5. A huid-pressure chamber, a valve-rod and a casing for the rod outside of said chamber and provided with a valve chamber, in combination With a valve surrounding the valve rod and longitudinally movable thereon.

6. A fluid-pressure chamber, a valve-rod and a Casing for the rod outside of said chamber and provided with a valve-chamber having valve-seats at both ends thereof, in oombination With a valve surroundin g the valverod and having a Working face at eaoh end.

'7. A steam-dome, a valve-rod having a screw-thread thereon and an annular valve having a tubular stem engaging said serewthread, in combination with an inelosing casing connected to the exterior of said dome.

8. A fluid-pressure chamber, a valvefrod, a casing for the rod outside of said chamber and an annular valve having a tubular stem and revolubly mounted on said rod to move longitudinally thereon, in combination with a valve-chamber; and a packing-chamber surrounding the tubular stein of said valve. 9. A fluid-pressure Chamber, a valve-rod and a casin g for the rod outside of said chamber7 in combination with a 'valve surrounding said valve-rod and having a rod-packing chamber at the end of its tubular stem and a packing-chamber for the stem of the valve.

10. A fluid-pressure chamber', a valve-rod and a oasin g for the rod outside of said Chamber and provided with a valve-chamber having a valve-seat at each end thereof, in oombination with a valve having a face at each end, surrounding the Valve-rod, longitudinally movable thereon and constructed to look the valve-rod in one of its positions.

In testimony whereof I have signed this speeiiioation in the presence of tWo subscribing Witnesses.y

JOHN P. GEIGER.

Witnesses:

HARRY M. ZULICK, CHAs. A. YEAGER. 

